Thanks Stone! but dont you think quit a hand full of airliners do have the option of monitoring the RPM including 757s and 320s with an APU page!
I understand that the APU is a constant speed engine but if I may say the "idle" of the APU is at about 95% isn't that wrong? and if you demand for any electrical or in my case pneumatic pressure the APU is getting loaded hence the RPM moves to 100% But as you said if the Pneumatic is demanded the EGT will go high but why the 737s do not have the option other than in a BITE test page (RPM is shown in the BITE test page - but this is not monitored in Normal Procedures : Engine startups?)
If a moment you can think that the NGs fixed with Sundstand APU's are FADEC ~ ECB controlled hence lets say there is no very much of a requirement for a RPM indication, but how about in classics and originals? do they have ?
Why doesn't the APU RPM is not a requirement ?
Sorry! one question trigger thousands!
Thanks for ur reply!
Cheers
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